<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <img src="../images/ad.jpg" class = 'gg'>
    <script>
        var gg = document.querySelector('.gg');
        function callback(){
            gg.style.display = 'none';
        }
        var timer = setTimeout(callback, 5000)
    </script>
</body>
</html>